After the final buzzer sounded, Gerald started skipping around the court, making eye contact with fans, and yelling obscenities at them.
Presumably, he was angry at the fans who wondered why he couldn't play the way he's playing this year, last year.
If he would have played even close to how he is this season, he wouldn't be in the situation. The Pacers wouldn't have traded him. They wouldn't have tried to unload him at all costs. Gerald was so bad last year, the Pacers were willing to include a future 1st rounder, and a 1st rounder that just finished his rookie season. Do you think the Pacers wanted to do that? No. Gerald was so bad last year that they couldn't keep him on and continue to progress as a team towards their ultimate goal of a championship.
Let's go to the numbers to give this a bit of perspective. Gerald shot 31.4% from three point range (League average was 35.9%). This nice link tells you that among the 113 players that attempted over 180 3-pointers, Gerald Green was 105th in 3pt percentage. His offensive rating was 95, 9 points below the team average of 104. His defensive rating was also below the team average of 99.8, at 103. His True Shooting Percentage of .465 was only better than one other rotation player (Sam Young), and by the slimmest of margins (.464). Only other Pacers players even below .500 were Ian and Roy and they were both higher than .489. This handy chart shows all guards and forwards that played over 1000 minutes ranked by their TS%. Gerald was 217th out of 225 players. And his Effective Field Goal Percentage told a similarly grim story. He was once again the second worst Pacers rotation player (.435), this time with only Tyler Hansbrough behind him (.432). Using the same criteria as TS%, Gerald shot up the chart in eFG%. He was 213th out of 225. So, I guess what I'm trying to say is, Gerald was a dire player last year. He was no good, rotten, terrible. Easily one of the worst rotation players on a title-contending team.
Knowing all that, why is Gerald mad the Pacers saw fit to trade him? The organization, and certainly the fans, would've much rather had Gerald be successful. It would have been way better for the Pacers. He was brought in, at a high cost, as someone who could help fix the bench, only he broke it more. How is that the fault of Pacers fans? Why are you yelling at them for your own failures, Gerald?
Gerald celebrated tonight like he won the Super Bowl. I hope his misplaced revenge keeps him happy. He's not going to be a successful NBA player, and the best team he'll ever be a part of already happened.